It can specifically describe the kinetics of crystallisation, can be applied generally to other changes of phase in materials, like chemical reaction rates, and can even be meaningful in analyses of ecological systems. [1] The equation is also known as the Johnson– Mehl – Avrami – Kolmogorov (JMAK) equation.

2015年2月1日 · The classical theory of Johnson–Mehl–Avrami–Kolmogorov (JMAK) is widely used to describe the kinetics of crystallization even when the premises required for its application are not strictly fulfilled.

2016年10月15日 · The applications of non-isothermal JMAK type equation in γ→α phase process of Fe-0.002 wt%C alloy under linear cooling process and welding thermal process do show its good agreements with the experimental data.

The kinetics of isothermal phase transformations have been described by the Johnson-Mehl-Avrami-Kohnogorov (JMAK) phenomenological model since the 40’

2023年7月6日 · The use of the Jonhson–Mehl–Avrami–Kolomogorov (JMAK) model has become prevalent in the kinetic analysis for Mg-based hydrogen storage alloys. However, the classical JMAK model has shown inadequate results in certain cases, resulting in poor fitness and/or inexplicably low Avrami exponent n.

JMAK方程是由W.A.Johnson和R.F.Mehl，M.Avrami 于1939年提出，用于表述形核类型的相变的进行程度 的（X）和经过时间（t）之间的关系 约翰逊-迈尔 (JMAK)相关理论 8 同时形核：假设V 0 的材料中有V o N o 个晶核，t时刻 恒定形核率形核：t时刻扩展的体积： n=3 n=4 约翰逊-迈尔 ...

1997年10月1日 · In particular, the following three situations, for which the JMAK theory requires extensions, are considered: (1) finite size effects and non-uniform nucleation, (2) anisotropic particle formation, and (3) transient nucleation. We present new …

1998年7月1日 · The FE method coupled with the extended JMAK model offers a comprehensive integration of various phenomena, including heat transport and mechanics in the strip and the roll, and the metallurgical...

In this paper we propose a procedure to obtain the JMAK parameters of the independent transformations that simultaneously occur during a crystallization process (e.g. leading to the formation of several crystalline phases). The predictions of the …

2020年10月15日 · 形核 孕育期 时间 形核类型 非形核类型 时间,t 非形核类型 方程述了 约翰逊一迈尔 (JMAK)相关理论 假定在某时刻t,2个相,每个体积为v 1-X (1-H (1-该) (1-v) In (1-X)=In U1 +In 近似:ln (1+x) 1) 相的生成相互碰撞过程 X代表相变完成程度h (1-X)≈ (v+v2+…+v2) →X≈1-exp (-v) 约 …